Hack at Korea Hydro and Nuclear Power Leads to Data Leaks, Including Blue Prints of Reactors

Computers at South Korea’s nuclear-plant operator were hacked, the company said on Monday, leading to leaks of internal data that include blueprints of reactors and radiation-exposure estimates.

The state-owned operator Korea Hydro & Nuclear Power Co. Ltd. said a probe into the breach was under way but declined to detail its progress. The company denied that its plants were in danger from a cyberattack, saying the controllers for the reactors are protected from a breach because they aren’t linked to external networks.